Effect of different rearing conditions on feeding activity, food consumption and growth in marbled rockfish Sebastiscus marmoratus larvae
2010
Narita, A., Tokai Univ., Shizuoka (Japan) | Kashiwagura, M. | Saito, H. | Okada, Y. | Akiyama, N.
This study investigated the diurnal changes of feeding activity, Daily food consumption (DFC) and growth of hatchery-reared marbled rockfish Sebastiscus marmoratus larvae from 2 to 35-day post-partum reared under different densities of rotifers and photoperiods. Larvae in all stages ingested food organisms only during lighted period, and they ingested about 47-68% of the DFC during the 3 hours before turning off. When the 2 days post-partum larvae were reared in deifferent densities of rotifers, the DFC was higher as the density was higher. When the 7 days post-partum larvae were reared in the diferent densities of rotifers, no difference was found in the DFC. When the larvae were reared under two different lighting conditions: 24 hours of light exposure and 12 hours of light exposure for 9 days, larval growth was better under the 24 hours of light exposure conditions. We confirmed that all of the larvae had ingested rotifers 44 hours post-partum under the 24 hours of light exposure conditions, while under the 12 hours of light exposure conditions, they were confirmed that all of them had ingested rotifers much later, 80 hours post-partum. Therefore, the larval feeding can be infulenced by feeding densities and photopeliods.
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